What to wear at work?

Hi all,
I am a men of 28 years old and live in the netherlands.
Since few months i started taking pride in my apperance.

I work for a contractor with a very informal attitude.
Most coworkers wear tshirts with washed jeans.
The project leaders wear tshirts and terrible fitting casual shirts on appointments.
The highest bosses only casual dress shirts with jeans. With rarely a suit.

I would like to dress sharp even at work but im afraid to overdress.
Even in dark jeans, well fitting shirt and nice shoes ill dress way sharper then 98% of thecompany.

What should i do?

With high reguards,